What is more, tunnels need power for lights and ventilation fans, and to run pumps when they flood, whereas Bridges require almost none.

除此之外，隧道需要电能来为隧道里的灯光与通风扇供电，还需要在隧道被淹的时候使用水泵，而桥梁则不需要这些。

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Power off and turn on the ventilator, allows for natural ventilation.

关闭电源，打开通风器，可实现自然通风。

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Investigators say gas accumulated during a power outage that shut down the mine's ventilation system.

调查人员说，由于断电，矿井内的通风设备停止运行，矿井内瓦斯积聚。

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Running the trains had been more difficult on the Manhattan side of the river, the official said, because there wasn't sufficient power to operate ventilation fans to clear diesel fumes.

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She believed the solar-paneled roof would power the entire car, not just the ventilation system, as is actually the case.

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The ship generates and distributes its own power, provides and maintains sanitation, heating, ventilation and air conditioning systems, and makes several hundred thousand gallons of water every day from sea water.

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